1440-TD001A-EN-P, XM Monitoring Modules Specifications

1440-TD001A-EN-P, XM Monitoring Modules Specifications
Measurement Modules
XM-120 Standard Dynamic Measurement
Module
and
Attribute
Indicators
Status indicators
XM-121 Low Frequency Vibration Module
The XM-120 and XM-121 modules are general-purpose,
dynamic measurement monitors. They are identical except
that the XM-121 module is designed for low-frequency
applications such as cooling tower fans, hydro turbines, and
other types of low-speed, rotating machinery. They are
suited for monitoring shaft, casing, or pedestal vibration in
rotating equipment.
Attribute
DeviceNet network
Standard DeviceNet protocol for all
functions (not power—module power is
provided independently)
Available EDS file provides support for most
DeviceNet compliant systems
Baud rate automatically set by bus master to
125, 250, or 500 Kbps
Configurable I/O Poll Response message
helps optimize space utilization within
scanner input tables.
Selectable poll response assembly
Selectable poll response size (bytes)
Serial
RS-232 via mini-connector or terminal base
unit
Baud rate fixed at 19,200 Kbps.
Local configuration via the Serial
Configuration utility.
XM-120 (1440-VST02-01RA)
XM-121 (1440-VLF02-01RA)
Transducer power
Eddy current transducer signals
Accelerometer signals
Voltage signals from any dynamic
measurement device, such as a velocity or
pressure transducer
Constant voltage 24V DC
Constant current 4.5 mA ± 20% from 24V DC
None (voltage input)
Tachometer can be powered, constant
voltage, or configured as voltage input
Voltage range
Selectable in software as 0…20V min;
40V max peak-to-peak
Sensitivity
User configurable in software
Input impedance
> 100 k:
Signal Conditioning
Sampling modes
Asynchronous
Synchronous
Frequency Range
1 Hz…20 kHz
Resolution
A/D conversion: 24 bits
Dynamic range: < 80 dBfs
(0.01% fs), -90 dBfs, typical
FFT lines/waveform block size:
100/256
200/512
400/1024
800/2048
Amplitude range
Dependent on sensitivity
Integration
Two levels provided, first in hardware,
second in firmware
Averaging
Any number of averages may be specified. If
sampling mode is:
Asynchronous: Averaging performed on
the spectra
Synchronous: Averaging performed on the
waveforms
Low pass filters
Independently configured per channel
Spectra FMAX (10 Hz…20 kHz)
Optional overall measurement LP filter
(200 Hz…20 kHz)
Roll Off: -24 db/octave
Tachometer Input
One tachometer input
±25V (50V max peak-to-peak)
1…50,000 events/revolution
Input impedance
120 k:min
Speed/frequency range
1…1,200,000 rpm
0.0167…20,000 Hz
Speed measurement
error
1…12,000 rpm: r1 rpm
12,001…120,000 rpm: r6 rpm
120,001…1,200,000 rpm: r50 rpm
Exponential Averaging Time Constant
parameter set to t 120 ms
Outputs
4…20 mA
Buffered outputs
Each output is independently programmed to
represent any measured parameter, from
either channel
Two isolated outputs
300 :max load
One active buffer per vibration input channel
Resistive buffer for tachometer
Module - red/green
Network - red/green
Channel 1 - yellow/red
Channel 2 - yellow/red
Tachometer - yellow/red
Setpoint multiplier - yellow
Relay - red
Communication
Inputs
Two channels
XM-120 (1440-VST02-01RA)
XM-121 (1440-VLF02-01RA)
Rockwell Automation Publication 1440-TD001A-EN-P - November 2010
5
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